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Materials 2016, 9(6), 445;

In Situ Elevated Temperature Testing of Fly Ash Based Geopolymer Composites

Geopolymer Research Group, John de Laeter Centre, Curtin University, GPO Box U1987, Perth WA 6845, Australia
Institute for Infrastructure Engineering, Western Sydney University, Penrith NSW 2751, Australia
Author to whom correspondence should be addressed.
Academic Editor: Javier Narciso
Received: 11 April 2016 / Revised: 26 May 2016 / Accepted: 30 May 2016 / Published: 3 June 2016
(This article belongs to the Special Issue Advances in Geopolymers and Alkali-Activated Materials)
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In situ elevated temperature investigations using fly ash based geopolymers filled with alumina aggregate were undertaken. Compressive strength and short term creep tests were carried out to determine the onset temperature of viscous flow. Fire testing using the standard cellulose curve was performed. Applying a load to the specimen as the temperature increased reduced the temperature at which viscous flow occurred (compared to test methods with no applied stress). Compressive strength increased at the elevated temperature and is attributed to viscous flow and sintering forming a more compact microstructure. The addition of alumina aggregate and reduction of water content reduced the thermal conductivity. This led to the earlier onset and shorter dehydration plateau duration times. However, crack formation was reduced and is attributed to smaller thermal gradients across the fire test specimen. View Full-Text
Keywords: fly ash geopolymers; alumina aggregate; in situ thermal testing; fire testing fly ash geopolymers; alumina aggregate; in situ thermal testing; fire testing

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Vickers, L.; Pan, Z.; Tao, Z.; Van Riessen, A. In Situ Elevated Temperature Testing of Fly Ash Based Geopolymer Composites. Materials 2016, 9, 445.

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